At least eight civilians were killed on Friday in renewed clashes between southern separatists and government forces in Aden, the seat of Yemen's internationally-recognised government, medical sources said.
The violence began this week after the separatists accused a political party allied to President Abd-Rabbu Mansour Hadi of complicity in the killing of an earlier missile attack on a military parade in the southern port city that killed 36 people.
Aden is located in southern Yemen, which is largely controlled by loyalist forces.
Southern Yemen was an independent state until 1990 and the north is perceived to have imposed unification by force.
The UAE is a key partner in a Saudi-led military coalition which intervened in Yemen more than four years ago to prop up Hadi's government in the face of an uprising by Iran-aligned Shiite Huthi rebels.
The Huthis control parts of northern and western Yemen, including the capital Sanaa.
